[Kpourdeilami]

Testing my domains on CloudFlare gives me:

> Serious problem detected!

> This domain will face issues after the 2019 DNS flag day. It will work in practice, BUT clients will experience delays when accessing this domain. We recommend you request a fix from your domain administrator!

Weird since they are listed as one of the supporters

[ogud]

Test again, CF systems are fully ENDS0 compliant https://ednscomp.isc.org/ednscomp/9c45882a1c

[bo0tzz]

I had the same result, but after trying again I got an OK.

[bcaa7f3a8bbc]

I think the test works by testing querying an authoritative server with EDNS on, and see if the request times out. Naturally, there will be false positives due to random packet loss on the Internet.